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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ca405eac660dff291c755e073c6f89dcebc8ac95eaab01af294ffb7a4850d8' 
  AND token = '8TeUvIftI3fcqDb0czgpVjSR+HFirb6HVQzsmUtUUmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}